JP2011204729A - Anode for electrolytic capacitor, and method for manufacturing the same - Google Patents

Anode for electrolytic capacitor, and method for manufacturing the same Download PDF

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JP2011204729A
JP2011204729A JP2010067797A JP2010067797A JP2011204729A JP 2011204729 A JP2011204729 A JP 2011204729A JP 2010067797 A JP2010067797 A JP 2010067797A JP 2010067797 A JP2010067797 A JP 2010067797A JP 2011204729 A JP2011204729 A JP 2011204729A
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sintered body
anode
electrolytic capacitor
body layer
support foil
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JP5570263B2 (en
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Ryo Higashine
亮 東根
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Lincstech Circuit Co Ltd
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Hitachi AIC Inc
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Abstract

PROBLEM TO BE SOLVED: To obtain a compact capacitor in which a powder sintered body for an electrode and a connection stable with an external are provided easily on the anode surface thereof, in order to solve such problems that a work for providing a powder sintered body becomes complicated and an anode shape also becomes larger by a portion since it is necessary to use the portion, which is not provided with the powder sintered body and protrudes on an outside of the powder sintered body, as a portion for connecting with an external, in a method partially providing a powder sintered body for an anode on a supporting foil surface when the powder sintered body for an electrode is provided on the supporting foil surface to form an oxide film by formation, as an electrode, in particular an anode, for an electrolytic capacitor.SOLUTION: In the anode for an electrolytic capacitor including a sintered body layer provided on a supporting foil surface, a compression part for external connection is provided in the sintered body layer.

Description

本発明は、電解コンデンサ用陽極およびその製造方法に関するものである。   The present invention relates to an electrolytic capacitor anode and a method of manufacturing the same.

電解コンデンサ用の電極、特に陽極には、単位面積当たりの静電容量を高めるため、電気化学的または化学的にエッチング処理することにより、エッチングピットを形成したエッチング箔の表面に、化成により酸化皮膜を設けるタイプと、支持箔表面に電極用の粉末焼結体を設け、化成により酸化皮膜を設けるタイプとがある。そして、外部との接続には、別部品としてリードタブ端子を陽極に重ね、ハトメまたはコールドウエル等により、化成により生じた酸化皮膜を貫いて電気的な接続をとっている。
また、エッチングピットの深さの限界や、エッチング処理を省けるメリットから、支持箔表面に電極用の粉末焼結体を設けるタイプの陽極の提案が盛んになってきている。
Electrodes for electrolytic capacitors, especially anodes, are subjected to electrochemical or chemical etching to increase the capacitance per unit area, thereby forming an oxide film on the surface of the etching foil formed with etching pits by chemical conversion. There is a type in which a powder sintered body for electrodes is provided on the surface of the support foil, and an oxide film is provided by chemical conversion. For connection to the outside, a lead tab terminal is stacked on the anode as a separate part, and an electrical connection is made through an oxide film formed by chemical conversion by eyelet or cold well.
In addition, due to the limitation of the depth of the etching pit and the merit of omitting the etching process, proposals of a type of anode in which a powder sintered body for an electrode is provided on the surface of a support foil have become popular.

ところで、小形のコンデンサの場合には、リードタブ端子の使用が困難であるため、特許文献1では、陽極箔内の一部に、エッチング前にマスキングすることにより、外部接続用の未エッチング部を設けることが記載されている。
また、支持箔表面に陽極用の粉末焼結体を設けるタイプ場合には、化成前にマスキングしようとしてもマスキング部の粉末焼結体内部に化成液がしみ込んでしまうために、外部接続用のマスキングが難しい。そのため、特許文献2には、格子状のマスクを使用して、陽極用の粉末とバインダとのスラリーをディスペンサーにより支持箔上に部分的に塗布し、焼結して陽極用の粉末焼結体を設け、次に粉末焼結体を設けていないそれより外側の部分をマスキングテープで被うことで化成処理することが記載されている。
By the way, since it is difficult to use a lead tab terminal in the case of a small capacitor, in Patent Document 1, an unetched portion for external connection is provided by masking a part of the anode foil before etching. It is described.
In the case of a type in which a powder sintered body for the anode is provided on the surface of the support foil, the chemical conversion liquid penetrates into the powder sintered body in the masking portion even if it is attempted to mask before the chemical conversion, so that masking for external connection is performed. Is difficult. For this reason, in Patent Document 2, a slurry of anode powder and binder is partially applied onto a support foil by a dispenser using a lattice mask, and sintered to be a powder sintered body for anode. Next, a chemical conversion treatment is described by covering a portion outside the powder sintered body with a masking tape.

特開2002−231582号公報JP 2002-231582 A 特開2003−243262号公報JP 2003-243262 A

しかしながら、支持箔表面に部分的に陽極用の粉末焼結体を設ける方法では、粉末焼結体を設ける作業が煩雑になり、また外部との接続のための部分として、粉末焼結体を設けていないそれより外側のはみ出した部分を使用する必要があるため、その分陽極の形状が大きくなってしまう。   However, in the method in which the powder sintered body for the anode is partially provided on the surface of the support foil, the work of providing the powder sintered body becomes complicated, and the powder sintered body is provided as a part for connection to the outside. Since it is necessary to use the protruding part outside that which is not, the shape of the anode becomes larger accordingly.

本発明は、上記の問題点を解決するためになされたもので、支持箔表面に陽極用の粉末焼結体と外部との安定な接続体とを容易に設ける、小形対応の電解コンデンサ用陽極およびその製造方法を得ることを目的としている。
The present invention has been made to solve the above-described problems, and is a small-sized electrolytic capacitor anode in which a powder sintered body for an anode and a stable connection body to the outside are easily provided on the surface of a support foil. And it aims at obtaining the manufacturing method.

本発明は、支持箔の表面に焼結体層を設けた電解コンデンサ用陽極において、前記焼結体層に外部接続用の圧縮部分を設けた電解コンデンサ用陽極を提供するものである。
また、支持箔の表面に焼結体層を設けた電解コンデンサ用陽極において、前記支持箔に凸状の肉厚部を設け、この凸状の肉厚部上の前記焼結体層に外部接続用の圧縮部分を設けた電解コンデンサ用陽極を提供するものである。
また、電解コンデンサの陽極用に、支持箔上に焼結体層を設ける第1工程と、前記焼結体層に外部接続用の圧縮部分を設ける第2工程と、前記陽極の表面を化成する第3工程とを備えた、電解コンデンサ用陽極の製造方法を提供するものである。
また、電解コンデンサの陽極用に、支持箔上に弁作用金属粉末とバインダが含まれる分散体を塗布する第1工程と、前記分散体の前記バインダを消失させる第2工程と、前記分散体に外部接続用の圧縮部分を設ける第3工程と、前記分散体を焼結する4工程と、表面を化成する第5工程とを備えた、電解コンデンサ用陽極の製造方法を提供するものである。
The present invention provides an anode for an electrolytic capacitor in which a sintered body layer is provided on the surface of a support foil, wherein the sintered body layer is provided with a compression portion for external connection.
Further, in the anode for an electrolytic capacitor having a sintered body layer provided on the surface of the support foil, a convex thick part is provided on the support foil, and external connection is made to the sintered body layer on the convex thick part. The anode for electrolytic capacitors provided with the compression part for is provided.
Also, a first step of providing a sintered body layer on the support foil for the anode of the electrolytic capacitor, a second step of providing a compressed portion for external connection on the sintered body layer, and forming the surface of the anode The manufacturing method of the anode for electrolytic capacitors provided with the 3rd process is provided.
In addition, for the anode of the electrolytic capacitor, a first step of applying a dispersion containing a valve metal powder and a binder on a support foil, a second step of eliminating the binder of the dispersion, and the dispersion The present invention provides a method for producing an anode for an electrolytic capacitor, comprising a third step of providing a compression portion for external connection, four steps of sintering the dispersion, and a fifth step of forming the surface.

本発明は、焼結体層に外部接続用の圧縮部分を設けたことにより、焼結体層の圧縮部分は、空孔率が充分減少するため、化成工程において化成液が浸透しにくく酸化皮膜形成が抑制されるので、陽極の一部に、外部との安定な接続体を容易に設けることができ、小形対応の電解コンデンサ用陽極を得ることができる。
In the present invention, since the compression portion for external connection is provided in the sintered body layer, the porosity of the compressed portion of the sintered body layer is sufficiently reduced. Since formation is suppressed, a stable connection body with the outside can be easily provided on a part of the anode, and a small-sized electrolytic capacitor anode can be obtained.

本発明の電解コンデンサ用陽極の作成方法を示している。1 shows a method for producing an anode for an electrolytic capacitor according to the present invention. 本発明の電解コンデンサ用陽極の別の作成方法を示している。3 shows another method for producing an anode for an electrolytic capacitor according to the present invention.

本発明に述べる支持箔は、粉末焼結体を支持するための支持体で、アルミニウム、タンタルなどの弁作用金属箔が使用できる。支持箔としては、特に限定されないが、加工が容易な点でアルミニウム箔が好ましい。また、支持箔の純度は、99.5質量%以上が好ましい。
また、支持箔は、その組成として、珪素、鉄、銅、マグネシウム、マンガン、チタン、クロム、亜鉛、ガリウム、バナジウム、ニッケル及びホウ素の少なくとも1種の合金元素を必要範囲内において添加した合金あるいは上記の不可避的不純物元素の含有量を限定したものも含まれる。
支持箔の厚みは、特に限定されないが、5μm以上100μm以下、特に、10μm以上50μm以下の範囲内とするのが好ましい。また、支持箔の表面は、粗面化しても良い。粗面化方法は、特に限定されず、エッチング、サンドブラスト等の公知の技術を用いることができる。
The support foil described in the present invention is a support for supporting a powder sintered body, and a valve action metal foil such as aluminum or tantalum can be used. Although it does not specifically limit as support foil, Aluminum foil is preferable at the point which is easy to process. The purity of the support foil is preferably 99.5% by mass or more.
In addition, the support foil has an alloy in which at least one alloy element of silicon, iron, copper, magnesium, manganese, titanium, chromium, zinc, gallium, vanadium, nickel and boron is added within a necessary range, or the above The content of the inevitable impurity element is limited.
The thickness of the support foil is not particularly limited, but is preferably in the range of 5 μm to 100 μm, particularly 10 μm to 50 μm. Further, the surface of the support foil may be roughened. The surface roughening method is not particularly limited, and known techniques such as etching and sandblasting can be used.

本発明に述べる焼結体層は、支持箔表面に設ける粉末の焼結体の層で、焼結体は弁作用金属からなる。
上記焼結体は、純度99.8質量%以上のアルミニウム、タンタルなどの弁作用金属少なくとも1種から構成される。また、例えば、珪素、鉄、銅、マグネシウム、マンガン、チタン、クロム、亜鉛、ガリウム、バナジウム、ニッケル及びホウ素の少なくとも1種の合金元素を必要範囲内において添加した合金あるいは上記の不可避的不純物元素の含有量を限定したものも含まれる。前記焼結体は、弁作用金属及び弁作用金属合金の少なくとも1種からなる粒子どうしが互いに空孔を維持しながら焼結したもので、この場合の空孔率は、通常30%以上70%以内の範囲内で所望の静電容量等に応じて適宜設定することができる。また、空孔率は、例えば出発材料の弁作用金属又は弁作用金属合金の粉末の粒径、添加するバインダ等により制御することができる。
焼結体層の形状は特に制限されないが、一般的には平均厚み50μm以上1000μm以下、特に100μm以上500μm以下のシート状であることが好ましい。薄いと支持箔割合が増え、電極抵抗は減少するが単位当たりの容量が減少する。厚いと焼結体層内部まで電解液が浸透しづらく容量の増加が抑えられてしまう。
The sintered body layer described in the present invention is a powder sintered body layer provided on the surface of the support foil, and the sintered body is made of a valve metal.
The sintered body is composed of at least one valve action metal such as aluminum or tantalum having a purity of 99.8% by mass or more. Further, for example, an alloy in which at least one alloy element of silicon, iron, copper, magnesium, manganese, titanium, chromium, zinc, gallium, vanadium, nickel and boron is added within a necessary range or the above inevitable impurity element Those with limited contents are also included. The sintered body is obtained by sintering particles composed of at least one of a valve action metal and a valve action metal alloy while maintaining pores, and the porosity in this case is usually 30% or more and 70%. Can be set as appropriate according to the desired capacitance within the range of. The porosity can be controlled by, for example, the particle diameter of the starting metal valve action metal or valve action metal alloy powder, the binder to be added, and the like.
The shape of the sintered body layer is not particularly limited, but is generally preferably a sheet shape having an average thickness of 50 μm to 1000 μm, particularly 100 μm to 500 μm. If it is thin, the ratio of the supporting foil increases and the electrode resistance decreases, but the capacity per unit decreases. If it is thick, it is difficult for the electrolyte to penetrate into the sintered body layer, and the increase in capacity is suppressed.

焼結体は、弁作用金属粉末、必要に応じてバインダ、溶剤、焼結助剤、界面活性剤等が含まれる分散体を焼結することにより得られる。
弁作用金属粉末の形状は、特に限定されず、球状、不定形状、鱗片状、繊維状等のいずれも使用できる。粉末の平均粒径は、0.1μm以上30μm以下、特に1μm以上20μmが好ましい。平均粒径が0.1μmより小さいと、所望の耐電圧が得られないおそれがある。また、30μmより大きいと、所望の静電容量が得られない場合がある。
バインダは、たとえばポリビニルアルコール樹脂、ポリビニルアセタール樹脂、ブチラール樹脂、フェノール樹脂、アクリル樹脂、尿素樹脂、酢酸ビニルエマルジョン、ポリウレタン樹脂、ポリ酢酸ビニル樹脂、エポキシ樹脂、メラミン樹脂、アルキド樹脂、ニトロセルロース樹脂、樟脳などがあげられ、これらは単独、あるいは、上記の樹脂を2種以上混合して利用することができる。
溶剤は、80℃以上200℃以下が好ましく使用できる。具体的な溶剤としてはシクロヘキサノン、メチルセルソルブ、アニソール、キシレン、ベンジルアルコール、ジエチレングリコールなどがあげられる。この他、水、あるいはメタノール、イソプロピルアルコール等のアルコール類、セルソルブ類、アセトン、メチルエチルケトン、イソホロン等のケトン類、N,N−ジメチルホルムアミド等のアミド類、酢酸エチル等のエステル類、ジオキサン等のエーテル類、塩化メチル等の塩素系溶媒、トルエン等の芳香族系炭化水素類等が挙げられるが、これらに限定されるものではない。これらの溶剤は、単独又は2種類以上混合して用いても良い。
上述の分散体は、各種の混練・分散機を用いて分散することができる。混練・分散にあたっては、攪拌機、二本ロール、三本ロール等のロール型混練機、縦型ニーダー、加圧ニーダー、プラネタリーミキサー等の羽根型混練機、ボール型回転ミル、サンドミル、アトライター等の分散機、超音波分散機、ナノマイザー等が使用できる。
このようにして作製された金属粉末分散体は、種々の塗布方法により塗布物として形成することができる。例えば、公知のロール塗布方法等により支持箔上に塗布物を形成することができる。また、塗布物の乾燥後、単位体積当たりの金属粉末の密度を上げるためにまた膜厚を平均化するために、プレスあるいはカレンダー処理をしてもよい。
The sintered body can be obtained by sintering a dispersion containing a valve action metal powder and, if necessary, a binder, a solvent, a sintering aid, a surfactant and the like.
The shape of the valve action metal powder is not particularly limited, and any of a spherical shape, an indefinite shape, a scale shape, a fiber shape, and the like can be used. The average particle size of the powder is preferably 0.1 μm or more and 30 μm or less, particularly preferably 1 μm or more and 20 μm. If the average particle size is less than 0.1 μm, the desired withstand voltage may not be obtained. On the other hand, if it is larger than 30 μm, a desired capacitance may not be obtained.
The binder is, for example, polyvinyl alcohol resin, polyvinyl acetal resin, butyral resin, phenol resin, acrylic resin, urea resin, vinyl acetate emulsion, polyurethane resin, polyvinyl acetate resin, epoxy resin, melamine resin, alkyd resin, nitrocellulose resin, camphor. These may be used alone or in combination of two or more of the above resins.
The solvent is preferably used at 80 ° C. or higher and 200 ° C. or lower. Specific examples of the solvent include cyclohexanone, methyl cellosolve, anisole, xylene, benzyl alcohol, and diethylene glycol. In addition, water, alcohols such as methanol and isopropyl alcohol, cersolves, ketones such as acetone, methyl ethyl ketone, and isophorone, amides such as N, N-dimethylformamide, esters such as ethyl acetate, and ethers such as dioxane And chlorinated solvents such as methyl chloride, and aromatic hydrocarbons such as toluene, but are not limited thereto. These solvents may be used alone or in combination of two or more.
The above dispersion can be dispersed using various kneading and dispersing machines. In kneading and dispersing, roll type kneaders such as stirrers, two rolls, three rolls, vertical type kneaders, pressure kneaders, blade type kneaders such as planetary mixers, ball type rotary mills, sand mills, attritors, etc. No. disperser, ultrasonic disperser, nanomizer and the like can be used.
The metal powder dispersion produced in this way can be formed as a coating by various coating methods. For example, the coated material can be formed on the support foil by a known roll coating method or the like. Further, after drying the coated product, press or calendar treatment may be performed in order to increase the density of the metal powder per unit volume and to average the film thickness.

本発明に述べる外部接続は、陽極と別の陽極との接続、または陽極と陽極から引き出される引き出し電極などとの接続をさす。   The external connection described in the present invention refers to a connection between an anode and another anode, or a connection between an anode and an extraction electrode drawn from the anode.

本発明に述べる圧縮部分は、本発明でバインダが加熱等で消失することで得られた空孔を維持しながら焼結した焼結体を圧縮した部分、または本発明でバインダが加熱等で消失することで得られた空孔を圧縮し、その後焼結した部分で、空孔率が充分減少した外部接続用の部分をさす。
作成方法は、ロールもしくはプレス機を用いた圧縮処理で、プレスヘッドのヘッドを押し付けることによって、陽極表面の一部に圧縮部分を形成することができる。または、冷間圧接により形成することもできる。
圧縮処理用のプレスヘッドのヘッド形状は、円形、だ円形または角形などの、各形状の底面の柱状体や、その変形体として、底面エッジにアールまたは斜めの面取をしたものが使用できる。陽極が圧縮処理で破断しないように、底面エッジにアールまたは斜めの面取をしたものが好ましい。
The compressed portion described in the present invention is a portion obtained by compressing a sintered body that is sintered while maintaining the voids obtained by the binder disappearing by heating or the like in the present invention, or the binder disappears by heating or the like in the present invention. By compressing the pores obtained in this way and then sintering, the portion for external connection in which the porosity is sufficiently reduced is indicated.
The production method can form a compressed portion on a part of the anode surface by pressing the head of the press head in a compression process using a roll or a press. Alternatively, it can be formed by cold welding.
The head shape of the press head for compression treatment can be a columnar body on the bottom surface of each shape such as a circle, an ellipse or a square, or a deformed body with a rounded or oblique chamfer on the bottom edge. In order to prevent the anode from being broken by the compression treatment, it is preferable that the bottom edge is rounded or obliquely chamfered.

本発明に述べる凸状の肉厚部は、支持箔表面の片面または両面から一体的に突出した凸形状部分で、陽極同士または陽極から引き出される引き出し電極などの外部との接続用の圧縮部分の下地として設ける。
形状は、直径が1mmから5mm程度の円柱、一辺が1mmから10mm程度の四角柱などとなるが、凸状の肉厚部のおおきさ、形状には特に限定はない。高さはいずれも焼結体層の厚さ程度かまたはそれ以下となる。
作成方法は、支持箔がコイル状で供給される場合には、圧延ローラに凸状の肉厚部に対応する凹部を複数設け、連続的に複数個作成する。支持箔が枚様の場合には平板プレスヘッドに凸状の肉厚部に対応する凹部を複数設け、プレスする方法で作成することができる。加工性が悪い場合には、200℃から300℃ほど加熱しながら成形を行ってもよい。
The convex thick part described in the present invention is a convex part integrally projecting from one or both surfaces of the surface of the support foil, and is a compression part for connection with the outside such as the extraction electrodes drawn from the anodes or the anodes. Provide as a base.
The shape is a cylinder having a diameter of about 1 mm to 5 mm, a square column having a side of about 1 mm to 10 mm, and the like. All the heights are about the thickness of the sintered body layer or less.
In the production method, when the support foil is supplied in a coil shape, the rolling roller is provided with a plurality of concave portions corresponding to the convex thick portion, and a plurality of the concave portions are continuously produced. When the supporting foil is sheet-like, it can be produced by a method in which a flat plate press head is provided with a plurality of concave portions corresponding to the convex thick portion and pressed. If the workability is poor, the molding may be performed while heating at about 200 ° C to 300 ° C.

以下、本発明の実施の形態を図面に基づいて説明する。
図1は、本発明の電解コンデンサ用陽極の作成方法を示している。
図1(a)は、支持箔を、図1(b)は、支持箔表面に焼結体層を設けた後を、図1(c)は、焼結体層に外部接続用の圧縮部分を設けた状態を示している。
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a method for producing an anode for an electrolytic capacitor according to the present invention.
1A shows a support foil, FIG. 1B shows a state after a sintered body layer is provided on the surface of the support foil, and FIG. 1C shows a compressed portion for external connection to the sintered body layer. The state in which is provided is shown.

以下、陽極の作成する方法を詳しく説明する。
支持箔1は、図1(a)に示すように、複数の陽極が一度に作成できる大きさたとえば幅が500mm程度の弁作用金属箔の枚様またはコイル状で供給する。
次に、図1(b)に示すように、弁作用金属粉末、必要に応じてバインダ、溶剤、焼結助剤、界面活性剤等が含まれる金属粉末分散体を塗布し、焼結させ焼結体層2を設ける。
次に、図1(c)に示すように、プレスのプレスヘッド3を押し付けることによって、焼結体層一部に圧縮部分4を形成する。
次に、化成処理によって焼結体の表面全体に誘電体である酸化皮膜を形成する。一般的に化成処理は、沸騰した純水中に浸漬し、表面に擬似ベーマイトを形成する。次に、ホウ酸、リン酸等の無機酸イオンや、モノカルボン酸、ジカルボン酸、オキシカルボン酸等の有機酸イオンを含む水溶液中に積層箔を浸漬し、所定の電圧を印加し、陽極酸化を行う。その後、熱処理、減極処理、陽極酸化を繰り返し、その後、洗浄、乾燥して化成工程を終了する。以上の工程により、本発明の電解コンデンサ用陽極の作成が完了する。
Hereinafter, a method for forming the anode will be described in detail.
As shown in FIG. 1 (a), the support foil 1 is supplied in the form of a valve-acting metal foil having a size capable of forming a plurality of anodes at a time, for example, a width of about 500 mm, or in the form of a coil.
Next, as shown in FIG. 1B, a metal powder dispersion containing a valve action metal powder and, if necessary, a binder, a solvent, a sintering aid, a surfactant, and the like is applied, sintered and sintered. A consolidated layer 2 is provided.
Next, as shown in FIG.1 (c), the compression part 4 is formed in a sintered compact layer part by pressing the press head 3 of a press.
Next, an oxide film as a dielectric is formed on the entire surface of the sintered body by chemical conversion treatment. In general, the chemical conversion treatment is immersed in boiling pure water to form pseudo boehmite on the surface. Next, the laminated foil is immersed in an aqueous solution containing inorganic acid ions such as boric acid and phosphoric acid, and organic acid ions such as monocarboxylic acid, dicarboxylic acid, and oxycarboxylic acid, and a predetermined voltage is applied, and anodization is performed. I do. Thereafter, heat treatment, depolarization treatment, and anodization are repeated, and then cleaning and drying are performed to complete the chemical conversion step. The above process completes the production of the electrolytic capacitor anode of the present invention.

図2は、本発明の電解コンデンサ用陽極の別の作成方法を示している。
図2(a)は、支持箔を、図2(b)は、支持箔に凸状の肉厚部を設けた後、図2(c)は、支持箔表面に焼結体層を設けた後、図2(d)は、焼結体層に外部接続用の圧縮部分を設けた状態を示している。
FIG. 2 shows another method for producing the anode for an electrolytic capacitor of the present invention.
2A is a support foil, FIG. 2B is a support foil provided with a convex thick portion, and FIG. 2C is a support foil surface provided with a sintered body layer. Thereafter, FIG. 2 (d) shows a state in which the sintered body layer is provided with a compression portion for external connection.

以下、陽極の作成する別の方法を詳しく説明する。
支持箔1は、図2(a)に示すように、複数の陽極が一度に作成できる大きさたとえば幅が500mm程度の弁作用金属箔の枚様またはコイル状で供給する。厚さは、後工程で凸状の肉厚部を設けるために、十分厚めに準備する。
次に、図1(b)に示すように、凸状の肉厚部5は、圧延ローラに凸状の肉厚部に対応する凹部を複数設け、連続的に複数個の凸状の肉厚部を片面または両面同時場所に作成する。支持箔1が枚様の場合には平板プレスヘッドに凸状の肉厚部に対応する凹部を複数設け、プレスする方法で作成することもできる。
次に、図2(c)に示すように、金属粉末分散体を塗布し、焼結させ焼結体層2を設ける。
次に、図2(d)に示すように、プレスのプレスヘッド3を押し付けることによって、焼結体層一部に圧縮部分4を形成する。
以下、図1の電解コンデンサ用陽極の作成方法と同様に化成し、本発明の電解コンデンサ用陽極の作成が完了する。
Hereinafter, another method for producing the anode will be described in detail.
As shown in FIG. 2 (a), the supporting foil 1 is supplied in the form of a valve-acting metal foil having a size capable of forming a plurality of anodes at a time, for example, a width of about 500 mm, or in a coil shape. The thickness is prepared to be sufficiently thick in order to provide a convex thick portion in a subsequent process.
Next, as shown in FIG. 1 (b), the convex thick portion 5 is provided with a plurality of concave portions corresponding to the convex thick portion on the rolling roller, and a plurality of convex thick portions are continuously provided. Create a part on one or both sides at the same time. When the support foil 1 is sheet-like, it can be formed by a method in which a flat plate press head is provided with a plurality of concave portions corresponding to convex thick portions and pressed.
Next, as shown in FIG. 2C, a metal powder dispersion is applied and sintered to provide a sintered body layer 2.
Next, as shown in FIG.2 (d), the compression part 4 is formed in a sintered compact layer part by pressing the press head 3 of a press.
Thereafter, formation is performed in the same manner as in the method for producing the electrolytic capacitor anode in FIG. 1, and the creation of the electrolytic capacitor anode of the present invention is completed.

支持箔に凸状の肉厚部を設け、この凸状の肉厚部上の焼結体層に外部接続用の圧縮部分を設けると、圧縮部分とその内部の支持箔の全膜厚が、圧縮部分以外の膜厚程度となることができ、陽極どうしの接続や、引き出し電極などの外部との接続に、圧縮部分が変形なく接続できる。
Providing a convex thick part on the support foil, and providing a compression part for external connection on the sintered body layer on this convex thick part, the total film thickness of the compression part and the support foil inside it is The film thickness can be about the thickness other than the compression portion, and the compression portion can be connected without deformation to the connection between the anodes and the connection to the outside such as the extraction electrode.

支持箔は、幅が500mm、厚さ50μmのアルミニウム箔をコイル状で供給する。
次に、平均粒径5μmのアルミニウム粉末100質量部にバインダとしてアクリル樹脂30質量部を混合し、溶剤としてのメチルセルソルブ50質量部に分散させ塗工液を準備する。
次に、塗工液を支持箔表面に塗布し、次に400℃の真空中で、バインダ等を分解除去後、650℃で焼結して片面厚さ100μmの焼結体層を得た。
次に、プレスのプレスヘッドを押し付けることによって、焼結体層の一部に1.5mm×2mmの楕円径の圧縮部分を形成する。
次に、化成処理によって焼結体の表面全体に誘電体である酸化皮膜を形成する。まず、沸騰した純水中に浸漬し、表面に擬似ベーマイトを形成する。次に、ホウ酸を含む水溶液中に積層箔を浸漬し、200Vの電圧を印加し、陽極酸化を行う。その後、熱処理、減極処理、陽極酸化を繰り返し、その後、洗浄、乾燥して化成工程を終了し、本発明の電解コンデンサ用陽極の作成が完了する。
As the support foil, an aluminum foil having a width of 500 mm and a thickness of 50 μm is supplied in a coil shape.
Next, 100 parts by mass of aluminum powder having an average particle diameter of 5 μm is mixed with 30 parts by mass of an acrylic resin as a binder, and dispersed in 50 parts by mass of methyl cellosolve as a solvent to prepare a coating solution.
Next, the coating liquid was applied to the surface of the support foil, and then the binder and the like were decomposed and removed in a vacuum of 400 ° C., and then sintered at 650 ° C. to obtain a sintered body layer having a thickness of 100 μm on one side.
Next, by pressing a press head of the press, a compressed portion having an elliptical diameter of 1.5 mm × 2 mm is formed in a part of the sintered body layer.
Next, an oxide film as a dielectric is formed on the entire surface of the sintered body by chemical conversion treatment. First, it is immersed in boiling pure water to form pseudo boehmite on the surface. Next, the laminated foil is immersed in an aqueous solution containing boric acid, and a voltage of 200 V is applied to perform anodization. Thereafter, heat treatment, depolarization treatment, and anodic oxidation are repeated, followed by washing and drying to complete the chemical conversion step, and the production of the electrolytic capacitor anode of the present invention is completed.

支持箔は、幅が500mm、厚さ50μmのアルミニウム箔をコイル状で供給する。
次に、凸状の肉厚部を圧延ローラに凸状の肉厚部に対応する凹部を複数設け、連続的に複数個の凸状の肉厚部を支持箔の両面の同時場所に作成する。
凸状の肉厚部は、陽極同士との接続の凸状の肉厚部を直径が1.5mmの円柱形状で、陽極から引き出される引き出し電極との接続の凸状の肉厚部は、一辺が3mmの四角注形状で形成する。
次に、プレスのプレスヘッドを押し付けることによって、凸状の肉厚部に圧縮部分を形成する。
次に、平均粒径5μmのアルミニウム粉末100質量部にバインダとしてアクリル樹脂30質量部を混合し、溶剤としてのメチルセルソルブ50質量部に分散させ塗工液を準備する。
次に、塗工液を塗布し、片面厚さ100μmの焼結体層を得た。
次に、化成処理によって焼結体の表面全体に誘電体である酸化皮膜を形成する。まず、沸騰した純水中に浸漬し、表面に擬似ベーマイトを形成する。次に、ホウ酸を含む水溶液中に積層箔を浸漬し、200Vの電圧を印加し、陽極酸化を行う。その後、熱処理、減極処理、陽極酸化を繰り返し、その後、洗浄、乾燥して化成工程を終了し、本発明の電解コンデンサ用陽極の作成が完了する。
As the support foil, an aluminum foil having a width of 500 mm and a thickness of 50 μm is supplied in a coil shape.
Next, the convex thick part is provided in the rolling roller with a plurality of concave parts corresponding to the convex thick part, and a plurality of convex thick parts are continuously created at the same place on both sides of the support foil. .
The convex thick part is a columnar shape with a diameter of 1.5 mm, and the convex thick part connected to the extraction electrode drawn from the anode is one side. Is formed in a 3 mm square shape.
Next, a pressed part of the press is pressed to form a compressed portion in the convex thick part.
Next, 100 parts by mass of aluminum powder having an average particle diameter of 5 μm is mixed with 30 parts by mass of an acrylic resin as a binder, and dispersed in 50 parts by mass of methyl cellosolve as a solvent to prepare a coating solution.
Next, the coating solution was applied to obtain a sintered body layer having a thickness of 100 μm on one side.
Next, an oxide film as a dielectric is formed on the entire surface of the sintered body by chemical conversion treatment. First, it is immersed in boiling pure water to form pseudo boehmite on the surface. Next, the laminated foil is immersed in an aqueous solution containing boric acid, and a voltage of 200 V is applied to perform anodization. Thereafter, heat treatment, depolarization treatment, and anodic oxidation are repeated, followed by washing and drying to complete the chemical conversion step, and the production of the electrolytic capacitor anode of the present invention is completed.

支持箔上に弁作用金属粉末とバインダが含まれる分散体を塗布し、次にこの塗布した分散体積層体を400℃の真空中で、バインダを分解除去後、分散体に外部接続用の圧縮部分を設けてから分散体を焼結する以外実施例1と同様に作製した。   A dispersion containing valve action metal powder and a binder is applied onto the support foil, and then the dispersion laminate thus applied is decomposed and removed in a vacuum at 400 ° C., and then the dispersion is compressed for external connection. It was produced in the same manner as in Example 1 except that the dispersion was sintered after providing the part.

1…支持箔、2…焼結体層、3…プレスヘッド、4…圧縮部分、5…凸状の肉厚部   DESCRIPTION OF SYMBOLS 1 ... Support foil, 2 ... Sintered body layer, 3 ... Press head, 4 ... Compression part, 5 ... Convex thick part

Claims (4)

支持箔の表面に焼結体層を設けた電解コンデンサ用陽極において、前記焼結体層に外部接続用の圧縮部分を設けた電解コンデンサ用陽極。   An electrolytic capacitor anode in which a sintered body layer is provided on the surface of a support foil, wherein the sintered body layer is provided with a compression portion for external connection. 支持箔の表面に焼結体層を設けた電解コンデンサ用陽極において、前記支持箔に凸状の肉厚部を設け、この凸状の肉厚部上の前記焼結体層に外部接続用の圧縮部分を設けた電解コンデンサ用陽極。   In the electrolytic capacitor anode in which a sintered body layer is provided on the surface of the support foil, a convex thick part is provided on the support foil, and the sintered body layer on the convex thick part is provided for external connection. Electrolytic capacitor anode with a compression part. 電解コンデンサの陽極用に、支持箔上に焼結体層を設ける第1工程と、前記焼結体層に外部接続用の圧縮部分を設ける第2工程と、表面を化成する第3工程とを備えた、電解コンデンサ用陽極の製造方法。   For the anode of the electrolytic capacitor, a first step of providing a sintered body layer on the support foil, a second step of providing a compression portion for external connection on the sintered body layer, and a third step of forming the surface The manufacturing method of the anode for electrolytic capacitors provided. 電解コンデンサの陽極用に、支持箔上に弁作用金属粉末とバインダが含まれる分散体を塗布する第1工程と、前記分散体の前記バインダを消失させる第2工程と、前記分散体に外部接続用の圧縮部分を設ける第3工程と、前記分散体を焼結する4工程と、表面を化成する第5工程とを備えた、電解コンデンサ用陽極の製造方法。   A first step of applying a dispersion containing a valve metal powder and a binder on a support foil for an anode of an electrolytic capacitor, a second step of eliminating the binder of the dispersion, and an external connection to the dispersion The manufacturing method of the anode for electrolytic capacitors provided with the 3rd process which provides the compression part for, 4 processes which sinter the said dispersion | distribution, and the 5th process which forms a surface.
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JP2007201239A (en) * 2006-01-27 2007-08-09 Hitachi Aic Inc Etching foil for electrolytic capacitor and method for manufacturing positive electrode foil using it
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CN104620342A (en) * 2012-09-13 2015-05-13 日本轻金属株式会社 Method for manufacturing electrode for aluminum electrolytic capacitor
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